But something on this did come out of the Soviet archives after the collapse. I believe the document in question was talked about here:
http://www.amazon.com/One-Hell-Gamble-Khrushchev-1958-1964/dp/0393317900/ref=sr_1_fkmr0_3?ie=UTF8&qid=1290926230&sr=8-3-fkmr0Although it might have been somewhere else (I have the book at the office and I'm not there right now). But I have read about it. From what I remember, it wasn't exactly a death wish, but Castro asking that the Soviets use nuclear weapons in the event of a US invasion, an idea the Soviets quickly threw cold water on.